outline
Its perimeter
outline
contour line
contour line
A margain could be drawn on any edge of a paraghraph.
The line that forms the edge of a figure is an edge line. Which forms the figure the has been drawn. You use this line to define a drawing or a figure.
a solid line at the edge of a paragraph.
An outside border is a line or edge that surrounds the outer boundary of an object, such as a document, image, or table. It is often used to define the limits or separation of the object from its surroundings.
Object Line
A straight line from the center of a circle to the outer edge is called a radius.
If you draw a line from the center of a circle to the edge of a circle, you have drawn the radius of the circle. If you draw a line from the edge of a circle through the center of the circle and on to the edge on the opposite side, you have drawn the diameter of a circle. The radius of a circle is one half the diameter of a circle.
A separator or a horizontal line.